Knight Cube - Power cube for your bike

[LockH]

[youtube]Ghqsz_idiv0[/youtube]

Originally crowd sourced back in 2014:
https://pozible.com/project/182336

... but now available from various places (ebay, amazon, etc.), for about $60.

From their pozible site:

The traditional way of generating is through the rotation of the tire. However, this results in high resistance and low generation efficiency because of the loss of energy due to friction between the tire and the ground.
In order to reduce the resistance, we used the innovative two- speed linkage which means resistance is proportional to the power efficiency. As of the current design, when riding faster than 10 km / h, the generator can reach an efficient power output, and when the speed reaches 20 km / h, it can achieve the maximum power output.
We handed out some engineering samples for riders to test. According to their feedback, they barely experienced any resistance.

So yeah, I understand there must be *some* "overhead" in terms of energy consumption, but maybe call this "ebike-related".

 

[skeetab5780]

Not a bad idea. Its nice they are becoming frictionless now. It's not too relevant for anyone who has a battery pack already strapped to the bike, we already have plenty of juice for that small stuff.

 

[MadRhino]

No matter how low the friction, there is a loss in generating power. The power used by your ebike battery to push it, will be more than the power produced by the generator, so it is more efficient to power accessories with your battery. Then, for pedal powered bikes this has some use if you prefer using your own energy to power accessories.